Majority of post-HSCT KIR⁺ NK cells belong to the CD56^dim NK subset. PBMC preparations from the patient at day +15 after HSCT and day +100 after HSCT were stained with monoclonal antibodies specific for CD3, CD56, KIR2DL1, KIR2DL3, KIR3DL1, CD16, and CD117. (A) Flow cytometric staining gated on CD3⁻CD56⁺ NK cells demonstrates that the overwhelming majority of KIR⁺ cells are CD56^dim at both time points. Data are representative of analysis from 15 patients. (B) Flow cytometric staining gated on CD3⁻CD56⁺ KIR⁺ cells shows the majority of cells at both time points are CD117⁻CD16⁺. Data are representative of analysis from 6 patients.